I guess the question is whether the improved propertiesof this new concrete makes up for the presumably higher price. Or perhaps it will be cheaper than regular concrete.

If it is more salt water proof and less prone to cracking it could be useful.

And of course the labor cost is always a factor with concrete. Setting rebar and erecting formwork is hard work. I think in order to make concrete seasteads economical a simple building method is needed. Like pouring it into prefab reusable forms.

Of concrete produces between 5 and 10% of greenhouse gasses in the atmosphere due to the coal fired kilns used to heat the limestone? I wouldn’t have thought that but in any case, I wonder how it fares over all against building and rebuilding structures out of lesser materials…

Like… wood? If you are concerned about greenhouse gases, chopping down trees would not be the way to go.

On the topic of carbon dioxide, methane, and other “greenhouse” gases causing “global warming”, I have little patience with “experts” discounting the changes in the output of the relatively unstable fusion reactor that provides all of our heat to begin with, but that is a topic for another thread.

Going back to the matter at hand, perhaps with this new way of creating concrete, less, or no, reinforcement will be necessary. That will definitely cut down on the costs, and overall weight, of any structure.

Imagine a seastead made with less concrete, no steel reinforcements, and lasting one hundred years. Now that’s a good start to freedom right there.

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There is no fate but what we make for ourselves. Each to his fate.

I’m with you on global warming.. sorry, climate change as it is now, but if one were concerned about carbon dioxide then building stuff out of trees is the best option – trees grow by taking in the CO2 from the atmosphere, once they are fully grown, the best thing to do would be to chop them down and bury them or use them in products, which stores that CO2 in the ground or in useful products and gives space for more trees to grow and therefore take in more CO2.

Yup, forestry is an industry that makes money from planting and selling trees. There is apparently more forest in Europe today than after the first world war because of this (I heard something to this effect in some TV show today). And you could probably build houses out wood and put them on a sea-going platform. But I don’t think it is very good for the parts that go in the water. Wooden boats are high maintenance.

Foamed concrete or concrete mixed with EPS foam can be lighter than water. You could pour a big solid slab of such material and just let it float in the water. Then put houses on top of it like a floating island. This should cut down on the labor required. But it would take a lot of concrete, so it might get expensive for this reason.